Method of and means for removing burr from strips



Aug. '7, 1945.

- 7 METHOD OF AND MEANS FOR REMOVING 5min EROM s TnIP's Filed 001 15, 1942 2 Sheets-Sheet 1 M AT TQRNEYS.

E. E. DAVIS ETAL I 2,381,807 7 Aug 7, 1945. 2,381,807 mm l-xon OF AND MEANS FOR REMOVING QBURRY ,FROM' STRIPS E. DAVIS EIAL Filed 00%,. 15,- 1942 ZSheeis-Sheet 2 FIGS.

-JU v 4TVENTOR. DAVIS and OMAS F. STEVENS.

ATTORNEYS.

1 tion of the material.

Patented Aug. "7, 1 945- [FlCE T g METHOD or AND MEANS son narrovmo smut mom s'ran's0 Elmer E. Davis and Thomas F. Stevens, Newton Falls, (lhio, asslgnors to The Thomas Steel Company, Warren, Ohio, a corporation of Milo Application October 15, 1962, Serial No. dd2,ll98

(oi. ltd- 1'?) This invention relates, as indicated, to a n ethod of and means for removing burr from s rip.

The cutting or slitting of sheet or strip metal by all methods heretofore employed results in the formation of a burr or raised edge adjacent the out. In the production of metal strip, it is highly desirable that there be no burr.

Attempts to remove the burr have heretofore been devised, involving operations such-as filing, grinding 'or rolling, each of which has proved objectionable, due to attendant faults affecting either the quality and uniformity of the removal of the burr or involving the economical produc part of this specification, and in which like nu-' merals are employed to designate like parts throughout the same,

Fig. 1 is a plan view, showing the method of removing the burr;

Fig. 2 is a cross-sectional view of the'strip,

' taken on the line 2'-2 of Fig. 1;

Fig. 3 is a cross-sectional view, on a slightly enlarged scale, taken on the line 3-3 of Fig. 1;

Fig. 4 is a cross-sectional view of the strip, taken on the line l-4 of Fig.1;

Fig. 5 is a view similar to Fig. 1, but showing a modified form of the method;

Fig. 6 is a cross-sectional view, taken on the line li--6 of Fig. 5, and Y Fig. 7 is a view similar to 6, but showing a still further modification of the method. I

Referring more particularly to Figs. 1 to 4 of the drawings, wherein for the purpose of'illustration, is shown' a preferred embodiment of the invention, a pair of rolls I, I is shown,

the wall 5, but this angle may be varied within reasonable limits.

For the purpose of removing the burr B from the strip s, the strip is passed through the rolls, as by pulling it in the direction indicated by the arrow in Fig. 1, with the side thereof which is free from burrs disposed against the walls 6 of the recesses 3, and the side thereof having.

the burrs B adjacent the walls 5 of these recesses. The rolls I are spaced from each other in such a manner that as the strip is pulled through the rolls in the manner described, the walls 4 of the recesses 3 force the strip towards the opposite walls 5, the flat lower surface of the strip S, as seen in Fig. 3, engaging the walls 5 as the strip engages the rolls. This results in a shearing ofl.-oi' the burrs B at the points 8 (Fig. 1) by the sharp edgs formed by the intersection of the walls 5 of the recesses with the peripheral walls I of the rolls, with the result that the strip emerges from the rolls in the condition shown in Fig. 4, i. e.. free from burrs.

It will be understood that the distance between the rolls must be properly adjusted to produce the desired shearing of the burrs. but

at the same time, to avoid concaving of the strip,

which might occur if the rolls were too closely spaced. During the aforesaid shearing or burr removing operations, the rolls will be rotated by the strip in the direction indicatedby the arrows in Fig. l.

If desired, the strip may be passed through a second set of rolls similar to the set which has been described, for the purpose of removing any vestiges of the burrs which were not removed by the first set, and for smoothing the strip at the points where the burrs were present.

It will be seen from the foregoing that the burr is removed .in a neat and expeditious manner,

and that the rotation of the rolls resultsin constantly presenting new shearing edges to the strip, so that such wear of'the rolls as occurs,

1 is uniformly distributed about the rolls.

these rolls being'revolubly. mounted on spindles Each of the rolls'is provided at its peripheral surface with an annular recess 3, the recess being bounded at one side by a conical wall I and at the other side by a wall 5 in the formof surface of revolution formed by revolving a line extending from the inner edge of the surface 4 to the periphery of the roll, and at right In the practice of the foregoing method, it is desired to point out that it is essential that the edges formed by the intersection of the walls 5 of the recesses with the peripheral walls I of the rolls be constantly maintained in a keenly sharp condition. This can be accomplished by sharpening such edges by taking a straight grinding cut off the peripheral walls I of the rolls. This grinding can be repeated until the width of the annular recess has been decreased to a point approaching the gauge thickness of the material from which the burr is to be removed, at which point the recess will no longer serve as a guide for the strip. -At such time the annular recess can. again be produced until-subsequent grind- 50 loss eventually reduce the rolls to a diameter, below which it would be impractical to go.

It is also highly desirable, in the practice of the foregoing method, that the strip be adjustably supported and held taut so as to be accu- 5 and 6.

Referring to Figs; 5 and 6, it will be seen that the strip S, before proceeding to the burr removing rolls I, is passed through a clamping device comprising a holder 8, a clamping bar 9, a clamp bar ill, a clamp screw ll, threadedly mounted in the holder 8, and adjustable to vary the location of the clamping bar. The clamp base i may also -be vertically adjusted, as by means of shims II, or by a micrometer screw (not shown). For the protection of the strip, as well as to equalize the pressure of the clamping bar and clamping base over the surfaces of the strip, pads l3 and ll, of felt or the like, are interposed between those elements and the strip.

The clamping, bar and clamp base are'so adj usted as to create back tension in the strip so as to maintain the strip in a taut condition while being fed into the burr removing rolls. This adjustment is also preferably such as to cause the strip to enter the rolls at a slight angle a, to the plane of the walls 5 of the rolls. In operation, this angle is very slight, while the shearing edges are sharp. As the shearing edges become dull, the angle a must be increased, so as to create a more forceful shearing action. In practice, the compression of the lower pad ll, permits as much increase in the angle a as is required.

Since, in the foregoing arrangement, the angle a can be increased only by squeezing the pad l4, and since this might result in the creation of more tension in the strip than is necessary, it may be desirable, under certain conditions, to employ the arrangement shown in Fig. 7. In this arrangement, the strip is passed through a clamping device similar to that shown in Fig. .6, but before passing to the burr removing rolls l, the strip is departing from the spirit of our invention, or the scope of the subjoined claims.

Having thus described our invention, we claim:

1. The method of'removing burr from a strip which consists in passing the strip through rolls having shearing edges adjacent the periphery of the rolls, and causing said strip to bear with sufficient pressure against said edges to cause said edges to shear the burr from the strip.

2. The method of removing burr from a strip which consists in passing the strip through rolls having shearing edges formed at the intersection of the peripheral surfaces of the rolls with surfaces extending inwardly of the rolls, and causing said strip to bear with sufllcient pressure against said edges to cause said edges to shear the burr from the strip.

3. The method of removinga burr from a strip which consists in passing the burred edge of the strip through a recess formed by two surfaces inclined to each other, and causing the burred edge of the strip to bear with sufficient pressure against one of said surfaces to cause the edge of said surface to shear the burr from the edge of the strip.-

4. The method of removing a burr from the edge of a strip, which consists in forcing the strip against a revoluble shearing edge with sufficient pressure to cause said edge to shear the burr from the strip.

5. The method of removing burr from a strip which consists in passing the strip through rolls having shearing edges formed at the intersection of the peripheral surface of the rolls with surpassed under a roller 15, mounted on a shaft l6,

supported in a bracket or bearing H, which is device.

It is to be understood that the invention is designed to be included with other operations, as

the strip is being uncoiled' and coiled for said For example, metal strip, uponoperations. leaving slitting or ripping operations, generally has a concaved section imparted by these opera- -faces extending inwardly of the rolls, the strip being passed through said rolls at a slight angle to said last-named surfaces.

6. The method of removing burr from a strip which consists in passing the strip through rolls having shearing edges adjacent the periphery of the rolls, and applying back tension to said strip while passing through said rolls.

9. The method of removing burrs from the edges of a strip, said method consisting in passing said edges over the intersections of shearing surfaces of rolls which are so disposed as to guide and support the strip edges, and controlling such passage in such a manner as to cause said intersections to apply a shearing action against those portions of the burred edges which extend beyond tions. A flattening operation is generally necessary, involving the stretching and/or flexing of the strip during an unwinding and winding operation. Dining this operation, the burr removal rollscould be mounted in receiving. relation to the flattening apparatus, and, during the same pass, the burr could be removed without addi'-- to be taken as preferred examples of the semen and that'various' changes in theshape, sire and" arrangement of parts may be resorted to, without the body of the strip, thereby removing said portions without altering the desired cross-section of the strip.

10. The method of removing burrs from the edges of a strip, said method consisting in assin said edges over the intersections of shearing surtrolling such passage in such a-manner as to cause. said intersections to apply a shearing action faces ofundriven rolls which are so disposed as to guide and support the strip edges, and conaga'inst those portions of the burred edges which extend beyond the body of the strip, thereby re- 7 moving said portions without altering the desired cross section of the strip.

ELM'ER E. DAVIS. THOMAS F. STEVENS. 

